SM803020

Flexible Ultra-Low Jitter Clock Synthesizer

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

July 22, 2013

Revision 1.0

hbwhelp@micrel.com or (408) 955-1690

General Description

The SM803020 is a dual-PLL clock generator that

achieves ultra-low, 74.2fs_rms output jitter at 156.25MHz

output frequency. It accepts a crystal input or a reference

input.

Each output channel is individually configurable to a

differential PECL, LVDS, HCSL, or CMOS output logic

level. PECL is selected by default, but can be overridden

through SPI. It is packaged in a dual-row 84-pin

7mm x 7mm package.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Typical Application

Features

•

Generates twelve 156.25MHz outputs

•

Independently programmable output logic:

−

Output logic: LVPECL (default), LVDS, HCSL,

LVCMOS

•

74.2fs jitter at 156.25MHz (1.875MHz to 20MHz)

•

Selectable inputs require 39.0625MHz input frequency

−

XTAL (default)

−

Differential or single-ended reference clock (SPI

selectable)

•

2.5V or 3.3V operating power supply

•

Separate output power supplies:

−

Different banks can be at different levels

•

Industrial temperature range (–40°C to +85°C)

•

Green, RoHS, and PFOS compliant

•

Available in 84-pin 7mm × 7mm QFN package

Applications

•

1/10/40/100 Gigabit Ethernet